To run this program interactively, type and enter the command: gnucap, from the command shell.

The prompt gnucap> shows that the program is in the command mode. You
should enter a command. Normally, the first command will be to build a
circuit, or to get one from the disk. First time users should turn to
the tutorial section for further assistance.

To run in batch mode, use gnucap -b file. It will run that
file then exit.

To load a file on starting, use gnucap file. This is
equivalent to starting with no arguments, then using the get
command to load a file.